Stable hydrosulfite preparation and process of making same.



UNTTED STATES PATENT oTTiou.

GADIENT ENGI, OF BASEL, SWITZERLAND, ASSIGNOR TO THE FIRM OF SOCIETY OF CHEMICAL INDUSTRY IN BASLE, OF BASEL, SWITZERLAND.

STABLE HYDROSULFITE PREPARATION AND PROCESS OF MAKING SAME.

To all whom it may concern:

Be it known that I, GADIENT ENGI, doctor of philosophy and chemist, a citizen of the SWlss Republic, and resident of Basel, Switzerland, have invented a new and useful Stable Hydrosulfite Preparation and a Process of Manufacturing the Same, of which the following is a full, clear, and exact specification.

Heretofore, so far as I am aware, it has been a matter of considerable difficulty to secure, bv the employment of commercial hydrosulfite preparations, permanent variegated discharge effects upon those ground colors which are difficultly discharged, and such effects have only been. practically attained when, accordingto the J eanmaire and Zundel processes, certain materials such as anilin or phenol have been added to the discharge color (see Zeitschm'ft far Farbenand TextiZ-Industrie IV, 1905, pages 425, 426 and 428).

According to the present invention a new hydrosulfite preparation, which is capable of general application for the production of discharge efl'ects, is produced by causing anhydroformaldehyde-anilin and formaldehyde to act in rapid succession on a concentrated aqueous solution of sodium hydrosulfite, whereby the sodium hydrosulfite is decomposed with formation of sodium phenylaminomethylsulfite (C H NH CH .O.SO Na) on the one hand, and sodium formaldehydesulfoxylate (OH.CH .O.SONa) on the other hand, while the formation of sodium phenylaminomethylsulfoxylate (C H NH CH.,.O.SONa),

lowing formula:

SO Na SO Na v SONa tom; orn-sno n, 511 .011

The solution obtained by the above reaction should be evaporated in vacuo, whereupon a colorless glassy mass is obtained which is stable in the air and consists in the Specification of Letters Patent. Application filed April 4, 1907. Serial No. 366.393.

Patented Nov. 26, 1907.

main of the aforesaid products of reaction, with but a small proportion of sodium formaldehyde sulfite.

This new product is particularly well suited for use as a discharge, for the reason that the discharge mixtures prepared therewith, under ordinary conditlons, and without the addition of other substances, yield better, purer and more complete variegated effects than are attainable by the employment of the various commercial hydrosulfite preparations even when the latter are employed with the addition of anilin or phenol.

In order that my improvements may be the better understood I will describe in detail the steps necessary for the production of the new'hydrosulfite preparatlon where previstrength is now rapidly introduced and the.

vesse is allowed to remain closed and is thoroughly shaken for some time, after which the solution is filtered to separate the undissolved anhydroformaldehyde and the filtrate is evaporated to dryness in vacuo. The product thus obtained, when employed in the proportion of from 280 to 300 grams per liter of discharge color, yields a vcomplete and pure white discharge even on paranitranilin red, and in the proportion of from 220 to 250 grams per liter yields permanent variegated discharge effects even on such round colors as are only dischar ed with difficulty by preparations hereto ore eniployed.

Example II: 21 parts of anilin are mixed with 25 parts of aqueous formaldehyde of 30 per cent. strength, and the mixture is well shaken until it has become heated, whereupon a thick oil se arates. 240 parts of water and 55 parts 0 sodium hydrosulfite of 73 per cent. strength are then added, the

closed vessel is thoroughly shaken for some minutes, and 38 parts of a solution of formaldehyde of 30' per cent. strength are added. After long stirring, the unattacked anhydroformaldehyi'le-anilin is filtered off and the solution is evaporated in vacuo.

Having thus described my invention, what I claim and desire to secure by Letters Pat-- cut is:

1. The herein described process of manu facturing a stable h drosulfite preparation suitable for the pro uction of discharge effects upon ground colors which consists in I causing an-hydroformaldehyde anilin and an aqueous solution of formaldehyde to act in rapid succession upon an aqueous solution of sodium hydrosulfiteand in transforming the.-

product of reaction thus obtained to a solid state by evaporation in vacuo.

2. As a new article of manufacture, the herein described stable h drosulfite pre aration suitable for the pro uction-of disc arge effects u on ground colors and consisting mainly o a mixture of sodium phenylaminomethylsulfite and of sodium formaldehydesulfoxylate, the said hydrosulfite preparation being a glassy mass, stable in the air.

In Witness whereof I have hereunto signed my name this 23d day of March, 1907, in the presence of two subscribing witnesses.

' GADIENT ENGI.

Witnesses:

GEO. GIFFORD, AMAND BRAUN. 

